Over the last 17 years, we have seen a pattern, that when left to buy a helmet on their own, 90% of consumers will pick a helmet at LEAST one size too large… often times 2 sizes. And to be clear, just because you have been wearing a size Large for 30 years, doesn’t mean it’s been RIGHT for 30 years.
Circumference is just ONE measurement to get you in the ballpark of what size you may be. Equally important is head shape! Place a football and a soccer ball on a counter and measure around their circumference. They may both measure 55 cm around, but would they both fit in the same opening? The football would need a larger hole, or one shaped the same for it to fit.
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